Adenosine is an endogenous nucleoside occurring in all cells of the body. It is chemically 6-amino-9-?-D-ribofuranosyl-9-H-purine and has the following structural formula:

Adenosine is an endogenous nucleoside occurring in all cells of the body. It is chemically 6amino-9-beta-D-ribofuranosyl-9-H-purine and has the following structural formula: